At least 13 Taliban militants were killed in a gunbattle with security personnel in Afghanistan's Ghazni province on Wednesday, police said.A group of armed Taliban fighters raided security checkpoints in Azad area of Gilan district on Wednesday, triggering a gunbattle that left 13 insurgents dead and six others injured, provincial police spokesman Fahim Amiri told Xinhua news agency.A Taliban group commander Mullah Ghulam Rasoul alias Hazla was also among those killed in fighting, the official said.One police constable has been injured, the official added.